How many sharks can we spot in this photo? The waves breaking in the background while the sharks cruise around the reef. Due to bans on fishing, large numbers of predators (sharks, snapper, and trevally) are found at the atoll, which makes it a perfect site to study blacktip reef sharks. (© Yannis P Papastamatiou)

How many sharks can we spot in this photo? The waves breaking in the background while the sharks cruise around the reef. Due to bans on fishing, large numbers of predators (sharks, snapper, and trevally) are found at the atoll, which makes it a perfect site to study blacktip reef sharks. (© Yannis P Papastamatiou)